accumulator derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "date": "date YYYY-MM-DD",
      "lang": "en",
      "leagues": "PL,PD,BL1,SA,FL1",
      "max_legs": "5",
      "strategy": "value"
    }
  },
  "output": {
    "type": "json",
    "errors": {
      "400": {
        "example": {
          "error": "invalid request"
        },
        "description": "Invalid or missing parameter(s). Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: <what is wrong and how to fix it> } plus usage hints."
      },
      "402": {
        "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free."
      },
      "500": {
        "example": {
          "error": "upstream_failed"
        },
        "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit."
      }
    },
    "example": {
      "date": "2026-06-07",
      "strategy": "value",
      "selections": [
        {
          "pick": "Over 2.5",
          "match": "Arsenal vs Chelsea",
          "market": "Over 2.5 Goals",
          "confidence": "HIGH",
          "competition": "Premier League",
          "decimal_odds": "1.72"
        },
        {
          "pick": "Yes",
          "match": "Bayern vs Dortmund",
          "market": "BTTS",
          "confidence": "HIGH",
          "competition": "Bundesliga",
          "decimal_odds": "1.85"
        }
      ],
      "acca_summary": {
        "risk_rating": "MEDIUM RISK",
        "combined_odds": "8.20",
        "ev_assessment": "Positive EV"
      },
      "banker_selection": "Over 2.5 Goals — Arsenal vs Chelsea"
    }
  }
}